WO2012115486A2 - Procédé et appareil de conversion d'une image, et procédé et appareil de conversion inverse d'une image - Google Patents

Procédé et appareil de conversion d'une image, et procédé et appareil de conversion inverse d'une image Download PDF

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Publication number
WO2012115486A2
WO2012115486A2 PCT/KR2012/001446 KR2012001446W WO2012115486A2 WO 2012115486 A2 WO2012115486 A2 WO 2012115486A2 KR 2012001446 W KR2012001446 W KR 2012001446W WO 2012115486 A2 WO2012115486 A2 WO 2012115486A2
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WO
WIPO (PCT)
Prior art keywords
matrix
discrete cosine
transform
upscaling
block
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2012/001446
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English (en)
Korean (ko)
Other versions
WO2012115486A3 (fr
Inventor
이태미
김일구
한우진
천지엔러
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Priority to US14/001,618 priority Critical patent/US20140072240A1/en
Publication of WO2012115486A2 publication Critical patent/WO2012115486A2/fr
Publication of WO2012115486A3 publication Critical patent/WO2012115486A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T9/00—Image coding
    • G06T9/007—Transform coding, e.g. discrete cosine transform
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/14—Fourier, Walsh or analogous domain transformations, e.g. Laplace, Hilbert, Karhunen-Loeve, transforms
    • G06F17/147—Discrete orthonormal transforms, e.g. discrete cosine transform, discrete sine transform, and variations therefrom, e.g. modified discrete cosine transform, integer transforms approximating the discrete cosine transform
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
    • H04N19/625—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding using discrete cosine transform [DCT]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
    • H04N19/61—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding in combination with predictive coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
    • H04N19/61—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding in combination with predictive coding
    • H04N19/619—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding in combination with predictive coding the transform being operated outside the prediction loop

Definitions

  • the quantization unit 130 minimizes the conversion error generated by using the substituted discrete cosine transform algorithm by applying a scaling matrix in the scaling process performed with the quantization.
  • FIG. 12 is a flowchart illustrating an image inverse transform method according to an embodiment of the present invention.
  • an inverse quantization unit 1120 is sqrt (BB T (i, i)), the inverse of 1 / sqrt (BB T (i, i)) obtained, and in step 1330, an inverse quantization unit 1120 of the A scaling matrix S having 1 / sqrt (BB T (i, i)) as the element of the i-th row is obtained.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Discrete Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • Mathematical Optimization (AREA)
  • Pure & Applied Mathematics (AREA)
  • Data Mining & Analysis (AREA)
  • Computational Mathematics (AREA)
  • Mathematical Analysis (AREA)
  • Software Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Algebra (AREA)
  • Databases & Information Systems (AREA)
  • Complex Calculations (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Compression Of Band Width Or Redundancy In Fax (AREA)
  • Image Processing (AREA)

Abstract

L'invention concerne un procédé et un appareil de conversion/conversion inverse d'une image. Le procédé de conversion d'une image selon un mode de réalisation de la présente invention implique la substitution des valeurs de nombres rationnels prédéterminés par des valeurs de fonctions trigonométriques parmi les éléments d'une matrice de transformation utilisée dans une transformée cosinusoïdale discrète, et la conversion d'un signal d'entrée sur la base de la valeur maximale du dénominateur d'une valeur intermédiaire générée au cours de la transformation lors de la réalisation d'une transformée cosinusoïdale discrète en utilisant la matrice de transformée cosinusoïdale discrète substituée, et la mise à l'échelle inférieure du signal converti.
PCT/KR2012/001446 2011-02-25 2012-02-24 Procédé et appareil de conversion d'une image, et procédé et appareil de conversion inverse d'une image Ceased WO2012115486A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US14/001,618 US20140072240A1 (en) 2011-02-25 2012-02-24 Method and apparatus for converting an image, and method and apparatus for inverse converting an image

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201161446753P 2011-02-25 2011-02-25
US61/446,753 2011-02-25

Publications (2)

Publication Number Publication Date
WO2012115486A2 true WO2012115486A2 (fr) 2012-08-30
WO2012115486A3 WO2012115486A3 (fr) 2012-11-15

Family

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PCT/KR2012/001446 Ceased WO2012115486A2 (fr) 2011-02-25 2012-02-24 Procédé et appareil de conversion d'une image, et procédé et appareil de conversion inverse d'une image

Country Status (3)

Country Link
US (1) US20140072240A1 (fr)
KR (1) KR20120098499A (fr)
WO (1) WO2012115486A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114239037A (zh) * 2021-12-27 2022-03-25 中国矿业大学 基于沙路法则的多图像加密方法

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CN104244010B (zh) * 2013-06-14 2018-03-23 浙江大学 提高数字信号变换性能的方法及数字信号变换方法和装置
KR101527103B1 (ko) * 2013-10-30 2015-06-17 고려대학교 산학협력단 이산 코사인 변환 장치 및 방법
CN105850124B (zh) 2013-12-22 2019-12-31 Lg电子株式会社 使用量化误差的额外的控制编码、解码视频信号的方法和装置
FR3033114A1 (fr) * 2015-02-19 2016-08-26 Orange Procede de codage et decodage d'images, dispositif de codage et decodage et programmes d'ordinateur correspondants
US10963581B2 (en) 2015-05-20 2021-03-30 Board Of Regents, The University Of Texas System Systems and methods for secure file transmission and cloud storage
CN108353175B (zh) * 2015-09-21 2021-03-12 Lg 电子株式会社 使用系数引起的预测处理视频信号的方法和装置
US20210195241A1 (en) * 2016-02-01 2021-06-24 Lg Electronics Inc. Method and device for performing transform using row-column transforms
US10542277B2 (en) * 2017-10-24 2020-01-21 Arm Limited Video encoding
TWI800765B (zh) * 2020-11-06 2023-05-01 瑞昱半導體股份有限公司 影像處理方法及影像處理系統

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US7082450B2 (en) * 2001-08-30 2006-07-25 Nokia Corporation Implementation of a transform and of a subsequent quantization
US7379956B2 (en) * 2002-07-14 2008-05-27 Apple Inc. Encoding and decoding data arrays
HUP0301368A3 (en) * 2003-05-20 2005-09-28 Amt Advanced Multimedia Techno Method and equipment for compressing motion picture data
US8069201B2 (en) * 2003-11-25 2011-11-29 Texas Instruments Incorporated 8×8 transform and quantization
US7689052B2 (en) * 2005-10-07 2010-03-30 Microsoft Corporation Multimedia signal processing using fixed-point approximations of linear transforms
US20070271321A1 (en) * 2006-01-11 2007-11-22 Qualcomm, Inc. Transforms with reduce complexity and/or improve precision by means of common factors
US8385424B2 (en) * 2006-06-26 2013-02-26 Qualcomm Incorporated Reduction of errors during computation of inverse discrete cosine transform
KR100899658B1 (ko) * 2007-04-16 2009-05-27 경희대학교 산학협력단 고속 동작을 위한 ｍｐｅｇ２／ｈ．２６４ 디지털 비디오트랜스코딩 시스템 및 방법

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114239037A (zh) * 2021-12-27 2022-03-25 中国矿业大学 基于沙路法则的多图像加密方法
CN114239037B (zh) * 2021-12-27 2024-06-04 中国矿业大学 基于沙路法则的多图像加密方法

Also Published As

Publication number Publication date
US20140072240A1 (en) 2014-03-13
WO2012115486A3 (fr) 2012-11-15
KR20120098499A (ko) 2012-09-05

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